What does the poppet valve do on a Yamaha outboard?
A poppit or poppet (sp?) valve is sort of a water-pressure regulator for the cooling system on an outboard engine. At slow rpm’s the pressure from the water pump is pretty low, so the poppit stays closed, and allows all the cooling water from the impeller to circulate thru the engine cooling system.
What opens the poppet valve?
Poppet valves are usually made up of a flat disk of metal with a long rod, known as the valve stem. The stem is used to push down on the valve and open it, with a spring generally used to close it when the stem is not being pushed on.
What does a poppet valve look like?
Poppet valve design and usage These valves have a slender stem and mushroom-shaped head that when utilised in a piston engine work by opening and closing the intake and exhaust ports in the cylinder head. The engine manoeuvres the valves by pushing on the stems with cams and cam followers.
What does a poppet do?
Unsourced material may be challenged and removed. In folk magic and witchcraft, a poppet (also known as poppit, moppet, mommet or pippy) is a doll made to represent a person, for casting spells on that person or to aid that person through magic. They are occasionally found lodged in chimneys.
Why are poppet valves used?
On gasoline engines, poppet valves are used to control the admission and rejection of the intake and exhaust gases to the cylinders. In the Figure (right centre), the valve, which consists of a disk with a tapered edge attached to a shank, is held against the tapered seat C by a compressed spring.
What is a poppet type valve?
A poppet valve consists of an orifice that is opened and closed by raising and lowering a sealing surface onto the orifice. It usually has an internal spring that holds the valve in the closed position. When the spring force is overcome, the sealing surface lifts off the orifice and the valve opens.
What is the purpose of a poppet?
Unsourced material may be challenged and removed. In folk magic and witchcraft, a poppet (also known as poppit, moppet, mommet or pippy) is a doll made to represent a person, for casting spells on that person or to aid that person through magic.